private void SendEventsFromJournal(bool checkOtherFiles)
{
lock (@lock)
try
{
// We are not checking file size to make decision about whether
// we should read the file. Reason being - the log write operations
// are often buffered, so we need to open the file to flush buffers
if (currentFile != null)
{
filePosition = ReadJournalFromPosition(currentFile, filePosition);
}
if (checkOtherFiles || currentFile == null)
{
string latestFile = LogEnumerator.GetLogFiles(logDirectory).FirstOrDefault();
if (latestFile == currentFile || latestFile == null)
{
return;
}
currentFile = latestFile;
filePosition = ReadJournalFromPosition(currentFile, 0);
}
}
catch (FileNotFoundException e)
{
Log.Error()
.Message("Journal file not found")
.Exception(e)
.Property("journal-file", currentFile)
.Write();
currentFile = null;
}
catch (Exception e)
{
Log.Error()
.Message("Error while reading journal file")
.Exception(e)
.Property("journal-file", currentFile)
.Write();
}
}
/// <summary>
/// Initializes a new instance of the <see cref="JournalMonitor"/> class.
///
/// </summary>
/// <param name="logDirectoryProvider">Log directory name provider</param>
/// <param name="checkInterval">Check interval in milliseconds</param>
public JournalMonitor(ILogDirectoryNameProvider logDirectoryProvider, int checkInterval = 10000)
{
logDirectory = logDirectoryProvider.Directory;
fileWatcher = new FileSystemWatcher(logDirectory);
fileWatcher.Changed += FileWatcher_Event;
fileWatcher.Created += FileWatcher_Event;
fileWatcher.NotifyFilter = NotifyFilters.CreationTime |
NotifyFilters.FileName |
NotifyFilters.LastWrite |
NotifyFilters.Size;
logFlushTimer.AutoReset = true;
logFlushTimer.Interval = checkInterval; // sometimes the filesystem event does not trigger
logFlushTimer.Elapsed += (o, e) => Task.Factory.StartNew(() => SendEventsFromJournal(false));
logFlushTimer.Enabled = true;
currentFile = LogEnumerator.GetLogFiles(logDirectory).FirstOrDefault();
filePosition = String.IsNullOrEmpty(currentFile) ? 0 : new FileInfo(currentFile).Length;
SendEventsFromJournal(false);
fileWatcher.EnableRaisingEvents = true;
Log.Info("Started monitoring");
}